Safety seat and base thereof

ABSTRACT

The present disclosure provides a base for a safety seat, which includes a base body and a support mechanism mounted with the base body for supporting the seat on a vehicle seat. The support mechanism includes a support member extending out of the base body and movable back and forth with respect to the base body, and an adjustment assembly configured to adjust a position of the support member with respect to the base body.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the priority of Chinese Patent Application No.202110104241.0, filed Jan. 26, 2021, the content of which is herebyincorporated by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to a safety seat and a bases for thesafety seat.

BACKGROUND

Safety seats, such as child safety seats, are mounted on the vehicleseats for carrying children to improve the safety of children in thevehicles. The safety seat ensures the safety of children in vehicles byreducing physical impact on children and limiting their body movement inthe case of an emergency, such as a collision or rapid deceleration. Thesafety seat can be fixed to the vehicle seat, however, existing safetyseats are not adjustable in position on the vehicle seats or are notstable enough when adjusted. In addition, the movement of children mayloosen the seat belt that fastens the safety seats, which may cause thesafety seats to move, bringing a risk to children in the vehicles.

SUMMARY

The present disclosure provides a base for a safety seat, which includesa base body and a support mechanism mounted with the base body forsupporting the seat on a vehicle seat. The support mechanism includes asupport member extending out of the base body and movable back and forthwith respect to the base body, and an adjustment assembly configured toadjust a position of the support member with respect to the base body.

The present disclosure also provides a safety seat, which includes abase and a seat body supported on the base. The base includes a basebody and a support mechanism mounted with the base body for supportingthe seat on a vehicle seat. The support mechanism includes a supportmember extending out of the base body and movable back and forth withrespect to the base body, and an adjustment assembly configured toadjust a position of the support member with respect to the base body.

The details of one or more embodiments of the present invention are setforth in the following drawings and description. Other features, objectsand advantages of the present invention will become apparent from thedescription, drawings and claims.

BRIEF DESCRIPTION OF THE DRAWINGS

To illustrate the technical solutions of the embodiments of the presentdisclosure, the accompanying drawings for describing the embodiments orthe prior art are introduced briefly in the following. Apparently, theaccompanying drawings in the following description are only someembodiments of the present disclosure, and persons of ordinary skill inthe art can derive other drawings from the accompanying drawings withoutcreative efforts.

FIG. 1 is a side view of a safety seat of an embodiment of the presentdisclosure.

FIG. 2 is a side view of the safety seat in FIG. 1 in another state.

FIG. 3 is a perspective view of the safety seat in FIG. 1.

FIG. 4 is a perspective view of a base of the safety seat of anembodiment of the present disclosure.

FIG. 5 is a front schematic view of the base in FIG. 4.

FIG. 6 is a front schematic view of the base in FIG. 4 in another state.

FIG. 7 a perspective view of a support member of the safety seat of anembodiment of the present disclosure.

FIG. 8 a perspective view of a support member of the safety seat ofanother embodiment of the present disclosure.

FIG. 9 a front schematic view of a base of the safety seat of anotherembodiment of the present disclosure.

FIG. 10 is a front schematic view of the base in FIG. 9 in anotherstate.

FIG. 11 a perspective view of a base of the safety seat of anotherembodiment of the present disclosure.

FIG. 12 is a perspective view of the base in FIG. 11 from another angle.

FIG. 13 is a schematic cross-sectional view of the base in FIG. 11.

DETAILED DESCRIPTION

Implementation of the present disclosure are elaborated below withreference to the accompanying drawings, to enable the objectives,advantages and features of the present disclosure more comprehensible.Specific details are described below to enable persons skilled in theart to fully understand the present disclosure. However, the presentdisclosure may be implemented in other manners besides those describedherein. Persons skilled in the art can make such improvements withoutdeparting from the concept of the present disclosure. Therefore, thepresent disclosure is not limited by the embodiments disclosed in thefollowing.

In the description of the present disclosure, it should be understoodthat terms such as “center”, “longitudinal”, “transverse”, “length”,“width”, thickness”, “front”, “up”, “down”, “front”, “back”, “left”,“right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”,“clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”and the like indicate orientation or positional relationships based onthe orientation or positional relationships shown in the accompanyingdrawings, and are intended only to facilitate and simplify thedescription of the disclosure, not to indicate or imply that the devicesor elements must have a particular orientation, be constructed andoperate in a particular orientation, and therefore are not to beconstrued as a limitation of the present disclosure.

In the present disclosure, unless otherwise expressly specified anddefined, terms such as “mount”, “connect”, “interconnect”, “secure”,“dispose” and other terms shall be understood in a broad way. Forexample, unless otherwise expressly defined, “connection” may be a fixedconnection, detachable connection, or integral connection; it may be amechanical connection, an electrical connection; it may be directconnection, or indirect connection through an intermedium; and it may bean internal connection of two components or an interaction between twocomponents. For example, when an element is described as “fixed” or“disposed” to another element, it may be directly on the other elementor there may be an intermedium element. For those of ordinary skill inthe art, the specific meaning of the above terms in the context of thepresent disclosure can be understood on a case-by-case basis.

In the present disclosure, unless otherwise expressly specified anddefined, if a first member is described to be on or under a secondmember, there may be direct contact between the first and secondmembers, or indirect contact between the first and second membersthrough an intermedium. Besides, if a first member is described to beabove a second member, it may mean that the first member is rightlyabove or diagonally above the second member, or that the first member ishorizontally higher above the second member. If a first member isdescribed to be below a second member, it may mean that the first memberis right below or diagonally below the second member, or that the firstmember is horizontally lower than the second member.

According to some embodiments of the present disclosure, one aspect ofthe present disclosure provides a safety seat which includes a seat bodyand a base for supporting the seat body. The base includes a base bodyand a support mechanism mounted with the base body for supporting thesafety seat on a vehicle seat. The support mechanism includes a supportmember extending out of the base body and movable back and forth withrespect to the base body and an adjustment assembly configured to adjusta position of the support member with respect to the base body.

According to some embodiments of the present disclosure, another aspectof the present disclosure provides a base for a safety seat. The baseincludes a base body and a support mechanism mounted with the base bodyfor supporting the safety seat on a vehicle seat. The support mechanismincludes a support member extending out of the base body and movableback and forth with respect to the base body and an adjustment assemblyconfigured to adjust a position of the support member with respect tothe base body.

The position of the safety seat on the vehicle seat may need to beadjusted during use. For example, when the inclination angle of the seatbody of the safety seat is adjusted, the base of the safety seat mayneed to be moved accordingly on the vehicle seat. Some embodiments ofthe present disclosure provide an adjustable support member. In theevent that the position of the base of the safety seat changes, thesupport member is adjusted correspondingly to abut against a backrest ofthe vehicle seat to better support the safety seat on the vehicle seat.

The safety seat of each embodiment of the present disclosure and thebase of the safety seat are described in detail below in conjunctionwith the accompanying drawings of the present disclosure.

According to the embodiment shown in FIGS. 1-7, the safety seat 10includes a seat body 20 and a base 30 for supporting the seat body 20.The base 30 further includes a base body 40 and a support mechanism 50mounted with the base body 40. The support mechanism 50 stably supportsthe safety seat 10 on the vehicle seat. The support mechanism 50includes a support member 51 and an adjustment assembly 52. The supportmember 51 extends out of the base body 40, and the adjustment assembly52 is configured to adjust and secure the position of the support member51 with respect to the base body 40.

According to an embodiment of the present disclosure, the seat body 20is configured such that an inclination angle thereof with respect to thebase 30 is adjustable. When the inclination angle of the seat body 20 isadjusted, the position of the base body 40 on the vehicle seat needs tobe adjusted correspondingly. Accordingly, the relative position of thesupport member 51 with respect to the base body 40 can be adjustedsimultaneously, i.e., the length of the support member 51 that extendsout of the base body 40 can be adjusted so that the support member 51can keep abutting against the seat backrest, thereby supporting andsecuring the safety seat 10 on the vehicle seat in a stable manner.FIGS. 1 and 2 show the support member 51 in a first position and in asecond position, respectively. In the second position, the supportmember 51 extends a relatively longer length out of the base body 40.

It should be noted that the above or following description as to thesupport member being configured to abut against the backrest of thevehicle seat back does not mean that the support member, in normal, isnecessarily in contact with backrest of the vehicle seat. Rather, itincludes the situation in which the two are separated by a smalldistance and abutment may occur only under certain circumstances. Forexample, when the safety seat moves a small distance, the support memberabuts against the backrest of the vehicle seat to limit the movement ofthe safety seat.

Referring to FIGS. 4-6, the base body 40 includes an upper housing and alower housing 41 which are assembled together (to show out the structureof the support mechanism 50, the upper housing is omitted in FIGS. 4-6).It should be understood that in other embodiments, the base body 40 maybe of a one-piece structure.

Referring to FIG. 7, the support member 51 has a tubular and rod-shapedstructure, and includes a support portion 510 and two connectingportions 511 respectively located on opposite sides of the supportportion 510 and connected to the same. The support portion 510 isconfigured to abut against the backrest of the vehicle seat. In someembodiments, the support portion 510 together with the connectingportions 511 may be supported on a seat surface of the vehicle seat.Further, a bending portion 512 may be provided between the connectingportion 511 and the support portion 510, and configured such that thelength L of the support portion 510 is greater than the distance Dbetween the ends E1, E2 of the connecting portion 511. A longer supportportion 510 provides a better support. Understandably, in the embodimentas shown in FIG. 8, the connecting portions 511 may extend directly fromthe support portion 510 without a bending portion, and in this case, thelength of the support portion 510 is equal to the distance between thetwo connecting portions 511. The connecting portions 511 are providedwith a plurality of positioning holes 513 arranged along a front-backdirection of the safety seat 10, respectively, and the positioning holes513 cooperate with the adjustment assembly 52 to adjust and secure theposition of the support member 51 with respect to the base body 40. Thelarger the number of positioning holes 513 is and the closer they arearranged, the greater the range of adjustment of the support member 51is and the higher the accuracy of adjustment is.

In other embodiments, each connecting portion 511 may be connected to aseparate support portion, i.e., each side of the base 30 is providedwith one support member, so that the two support members can be adjustedindependently of each other.

Continuing to refer to FIGS. 4-6, the connecting portions 511 of thesupport member 51 are inserted into the base body 40. Corresponding tothe connection part 511, the base body 40 is provided with guide rails42 on both sides. In an embodiment, the guide rails 42 are provided onboth sides of the lower housing 41. The connecting portions 511 areaccommodated and slide in the guide rails 42 during the adjustment ofthe support member 51, respectively.

Referring to FIGS. 4-6, the adjustment assembly 52 includes an operativemember 520, a drive member 521 connected to the operative member 520,and at least one securing member 522 connected to the drive member 521.The securing member 522 has a rod-shaped structure. In the embodimentshown in FIGS. 4-6, the adjustment assembly 52 has a pair of securingmembers 522 disposed on two sides of the drive member 521 respectively.It should be understood that in other embodiments, the adjustmentassembly may include one or more than two securing members. The securingmembers 522 may be inserted into the positioning holes 513 of thesupport member 51 to secure the position of the support member 51 withrespect to the base body 40. The drive member 521 and the operativemember 520 are located in the same operating plane (not labeled). Whenthe operative member 520 is moved from a first position to a secondposition along the operating plane, it drives the drive member 521 torotate in a clockwise or counterclockwise direction and disengages thesecuring members 522 from the positioning holes 513, and when theoperative member 520 is moved from the second position to the firstposition, it drives the drive member 521 to rotate reversely in theopposite direction and inserts the securing members 522 into thepositioning holes 513. In this embodiment, the operative member 520 ismoved along a front-back direction of the operating plane between thefirst position and the second position. According to the structure shownin the illustrated embodiment, one end of the drive member 521 ispivotally connected to the operative member 520 and the other end of thedrive member 521 is pivotally connected to the securing members 522. Thedrive member 521 is pivotally provided on the base body 40 by beingpivoted to the lower housing 41 through a pivot point. The pivot pointthus divides the drive member 521 into two segments that are connectedto the operative member 520 and the securing member 522, respectively,thereby enabling the operative member 520 to control the reciprocalmovement of the securing members 522 by means of leverage. The operativemember 520 shown in FIG. 5 is located at the first position where thesecuring members 522 are inserted in the positioning holes 513 and theposition of the support member 51 is secured at this moment. Theoperative member 520 shown in FIG. 6 is at the second position where thesecuring members 522 are disengaged from the positioning holes 513, andat this moment, the support member 51 can be freely adjusted to desiredpositions. When the operative member 520 is moved, for example, by theuser's operation, from the first position to the second position alongthe front-back direction of the operating plane, the operative member520 rotates the drive member 521 and disengages the securing members 522from the positioning holes 513. When the operative member 520 is movedfrom the second position to the first position, the drive member 521rotates reversely in the opposite direction, which inserts the securingmembers 522 into the positioning holes 513.

The adjustment assembly 52 may also include a resilient member, such asa spring 523. The spring 523 abuts against the operative member 520 toprovide a resilient force to the operative member 520. When theoperative member 520 is released from the second position, the spring523 may restore the operative member 520 to the first position. Inaddition, a limiting member 43 is provided on the base body 40 to limitthe rotation amount of the drive member 521. In an embodiment, thelimiting member 43 is provided on the lower housing 41. The drive member521, when rotates, will interfere with the limiting member 43 to limitthe rotation amount.

The base body 40 is provided with positioning slots 44 through which thesecuring members 522 pass. The securing member 522 are slidable withinthe positioning slot 44 in a transverse direction, but immovable in thefront-back direction as being restricting by the positioning slot 44. Inan embodiment, the positioning slot 44 is provided on the lower housing41. In addition, in order to further stabilize the connecting portions511 of the support member 51 in the guide rails 42 and prevent theconnecting portion 511 from detaching from the guide rail 42, the basebody 40 further includes stoppers 45 mounted above the guide rails 42 torestrict the connecting portions 511 of the support member 51. In anembodiment, the stoppers 45 can be fixed above the guide rail 42 byscrews.

FIGS. 9-10 show another embodiment of the present disclosure, which hasa different structure of adjustment assembly than the embodiment shownin FIGS. 4-6. Specifically, the adjustment assembly 62 includes anoperative member 620, a drive member 621 connected to the operativemember 620, and securing members 622 connected to the drive member 621.The operative member 620 shown in FIG. 9 is in a first position wherethe securing members 622 is inserted in the positioning holes 513 sothat the position of the support member 51 is secured. The operativemember 620 shown in FIG. 10 is in a second position where the securingmembers 622 are disengaged from the positioning holes 513, and thus thesupport member 51 can be freely adjusted to desired positions at thismoment. The drive member 621 is provided with guide slots 624, and oneend of the securing member 622 is movably constrained in the guide slot624. The guide slot 624 is configured to disengage the securing member622 from the positioning hole 513 when the operative member 620 is movedfrom the first position to the second position along the front-backdirection of the safety seat 10, and insert the securing member 622 intothe positioning hole 513 when the operative member 620 is moved from thesecond position to the first position along the front-back direction ofthe safety seat 10. In a more specific embodiment, an angle ofinclination between the extension direction of the guide slot 624 andthe front-back direction of the safety seat 10 is provided, whichconverts the movement of the operation member 620 in the front-backdirection to the movement of the securing member 622 in the transversedirection perpendicular to the front-back direction.

The adjustment assembly 62 may include a resilient member, such as aspring 623, which abuts against the drive member 621 to provide aresilient force to the drive member 621 and the operative member 620.The spring 623 may restore the operative member 620 to the firstposition when the operative member 620 is released from the secondposition.

In the two embodiments of the adjustment assemblies 52, 62 describedabove, the operative members 520, 620 are located at the front of thebase body 40 and are exposed outside of the base body 40 so that theuser can easily and directly operate the operative members 520, 620 toadjust the support member 51 without having to remove the safety seat 10from the vehicle seat.

In the above described embodiment, the support member 51 can be manuallyoperated by the user to adjust the length of the support member 51extending out of the base body 40 when the adjustment assembly 52, 62unlocks it. In addition, in a modified embodiment, the support mechanism50 further includes a resilient assembly (not shown) that cooperateswith the support member 51 to provide a continuous resilient thrust tothe support member 51 such that the support member 51 can extend out ofthe base body 40 automatically to a desired position when it isunlocked. For example, when the safety seat 10 is moved forward on thevehicle, which thus requires elongation of the support member 51, thesupport member 51, if unlocked, extends backward automatically until itabuts against the backrest of the vehicle seat.

FIGS. 11-13 show another embodiment of the present disclosure, in whichan adjustment assembly 72 includes an operative member 720 and asecuring member 722. The securing member 722 is fixed to the supportmember 51. The operative member 720 is provided with a plurality ofpositioning grooves 725 arranged along the front-back direction of thesafety seat 10. The larger the number of positioning grooves 725 is andthe closer they are arranged, the greater the range of adjustment of thesupport member 51 is and the higher the accuracy of adjustment is. Theoperative member 720 is configured to move between a first position anda second position in a height direction of the safety seat 10. FIG. 13shows the operative member 720 in a first position where the securingmember 722 is inserted in the positioning groove 725 to secure theposition of the support member 51. When the operative member 720 is inthe second position, the securing member 722 is disengaged from thepositioning groove 725 and the support member 51 can be freely adjustedto desired positions at this moment. For example, when the operativemember 720 is pulled downward by the user to move from the firstposition to the second position, the positioning groove 725 of theoperative member 720 releases the securing member 722, i.e., releasesthe support member 51, and the support member 51 can be freely adjustedat this moment.

The adjustment assembly 72 may also include a resilient member, such asa spring 723 that abuts against the operative member 720 to provide aresilient force to the operative member 720. The spring 723 may drivethe operative member 720 to move back to the first position when theoperative member 720 is released from the second position.

In contrast to the embodiments described previously, in the embodimentshown in FIGS. 11-13, only a single positioning hole 513 for eachconnecting portion is provided to secure the securing member 722 to thesupport member 51.

In other embodiments, the adjustment assembly may include a linearactuator (not shown) that drives the support member 51. For example, thelinear actuator may include an air cylinder, a hydraulic cylinder, or aball screw, etc. The linear actuator may actuate the support member 51based on operating instructions. For example, the actuator directlyactuates the connecting portions 511 of the support member 51 to move ina front-back direction to achieve position adjustment of the supportmember 51 with respect to the base body 40, thereby ensuring that thesupport member 51 abuts against the backrest of vehicle seat, in theevent that the position of the safety seat 10 needs to be adjusted toensure stability of the safety seat 10. The linear actuator may furtherlock the support member 51 in the adjusted position. Compared with theprevious embodiment, the use of an actuator eliminates the need formanual pushing and pulling of the support member, or provides a moreeffortless means of operation, thereby facilitating the user'soperation.

It will be understood by those skilled in the art that in addition tothe various structural forms of the adjustment assembly described above,other adjustment assemblies of the prior art may be used, provided thatthe adjustment assembly is capable of adjusting or locking the positionof the support member in the front-back direction. The specificstructure and mechanism of these other adjustment components are knownto those skilled in the art, so they are not described in detail here.

According to the safety seat and the base of the safety seat provided byvarious embodiments of the present disclosure, when the position of thesafety seat on the vehicle seat needs to be adjusted, for example, whenthe base of the safety seat needs to be moved forward away from thebackrest of the vehicle seat, the length of the support member of thesupport mechanism extending out of the base body can be increased toensure that the support member keeps abutting against or close to thebackrest of the vehicle seat, so that the safety seat can be betterstabilized on the vehicle seat. When the seat base needs to be movedback closer to the backrest of the vehicle seat, it is only necessary toshorten the length of the support member extending out of the seat body.In another situation, when the seat belt is loosened due to a child'saction, the support member can be adjusted to keep abutting against thebackrest of vehicle seat and keep the seat belt in a tight state, so asto ensure the safety of children in the vehicle.

The technical features of the above described embodiments can becombined in any way according to the actual situations. Forsimplification purpose, not all possible combinations of the technicalfeatures in the above described embodiments are described. however, aslong as there is no contradiction in the combination of these technicalfeatures, they should be considered to fall with the scope of thepresent disclosure.

Only several embodiments of the present disclosure are described withmore specific and detailed descriptions, but they are not intended to bea limitation of the scope of the patent invention. It should be notedthat for a person of ordinary skill in the art, a number ofmodifications and improvements can be made without departing from theconception of the present invention, which all belong to the patentscope of the present invention. Therefore, the patent scope of thepresent invention shall be subject to the attached claims.

What is claimed is:
 1. A base for a safety seat, comprising: a basebody; and a support mechanism mounted with the base body for supportingthe safety seat on a vehicle seat, the support mechanism comprising: asupport member extending out of the base body and movable back and forthwith respect to the base body; and an adjustment assembly configured toadjust a position of the support member with respect to the base body.2. The base of claim 1, wherein the support member comprises a supportportion configured to abut against a backrest of the vehicle seat and aconnecting portion connected to the support portion.
 3. The base ofclaim 2, wherein the connecting portion comprises a plurality ofpositioning holes, and the adjustment assembly comprises at least onesecuring member, the at least one securing member being inserted into atleast one of the positioning holes to secure the support member in aposition with respect to the base body.
 4. The base of claim 3, whereinthe adjustment assembly further comprises a drive member and anoperative member, the drive member being rotatably provided on the basebody, the drive member and the operative member being located in anoperating plane, one end of the drive member being rotatably connectedto the operative member and the other end of the drive member beingconnected to the securing member, wherein the drive member is driven torotate in a clockwise or counterclockwise direction so as to disengagethe securing member from the positioning hole when the operative memberis moved from a first position to a second position along the operatingplane, and the drive member is driven to rotate reversely so as toinsert the securing member into the positioning hole when the operativemember is moved from the second position to the first position.
 5. Thebase of claim 4, wherein the base body is provided with a limitingmember configured to limit a rotation amount of the drive member.
 6. Thebase of claim 4, wherein the base body is provided with a positioningslot, and the securing member slides within the positioning slot.
 7. Thebase of claim 3, wherein the adjustment assembly comprises an operativemember and a drive member connected to the operative member, the drivemember having a guide slot, one end of the securing member beingconstrained in the guide slot, the guide slot being configured such thatthe operative member disengages the securing member from the positioninghole when the operative member is moved from a first position to asecond position along a front-back direction of the safety seat, andinserts the securing member into the positioning hole when the operativemember is moved from the second position to the first position.
 8. Thebase of claim 2, wherein the adjustment assembly comprises an operativemember and a securing member, the securing member being fixed to theconnecting portion, the operative member being provided with a pluralityof positioning grooves, the operative member being configured to bemovable between a first position and a second position in a heightdirection of the safety seat, the securing member being put into thepositioning groove when the operation member is located in the firstposition, and disengaged form the positioning groove when the operativemember is located in the second position.
 9. The base of claim 4,wherein the adjustment assembly further comprises a resilient memberconfigured to restore the operative member.
 10. The base of claim 1,wherein the adjustment assembly comprises a linear actuator that drivesa movement of the support member.
 11. The base of claim 1, wherein thesupport mechanism further comprises a resilient assembly that provides acontinuous resilient thrust to the support member.
 12. The base of claim2, wherein the support portion extends in a transverse directionperpendicular to a front-back direction of the safety seat, and theconnecting portion extending at opposite sides of the support portionalong the front-back direction of the safety seat.
 13. The base of claim12, wherein the support member comprises a bending portion between theconnecting portion and the support portion, and the support portion hasa length greater than a distance between two ends of the connectingportion.
 14. A safety seat, comprising a base and a seat body supportedon the base, the base comprising: a base body; and a support mechanismmounted with the base body for supporting the safety seat on a vehicleseat, the support mechanism comprising: a support member extending outof the base body and movable back and forth with respect to the basebody; and an adjustment assembly configured to adjust a position of thesupport member with respect to the base body.
 15. The safety seat ofclaim 14, wherein the seat body is configured such that an inclinationangle of the seat body with respect to the base is adjustable.
 16. Thesafety seat of claim 14, wherein the support member comprises a supportportion configured to abut against a backrest of the vehicle seat and aconnecting portion connected to the support portion.
 17. The safety seatof claim 16, wherein the connecting portion comprises a plurality ofpositioning holes, and the adjustment assembly comprises at least onesecuring member, the at least one securing member being inserted into atleast one of the positioning holes to secure the support member in aposition with respect to the base body.
 18. The safety seat of claim 17,wherein the adjustment assembly further comprises a drive member and anoperative member, the drive member being rotatably provided on the basebody, the drive member and the operative member being located in anoperating plane, one end of the drive member being rotatably connectedto the operative member and the other end of the drive member beingconnected to the securing member, wherein the drive member is driven torotate in a clockwise or counterclockwise direction so as to disengagethe securing member from the positioning hole when the operative memberis moved from a first position to a second position along the operatingplane, and driven to rotate reversely so as to insert the securingmember into the positioning hole when the operative member is moved fromthe second position to the first position.
 19. The base of claim 17,wherein the adjustment assembly comprises an operative member and adrive member connected to the operative member, the drive member havinga guide slot, one end of the securing member being constrained in theguide slot, the guide slot being configured such that the operativemember disengages the securing member from the positioning hole when theoperative member is moved from a first position to a second positionalong a front-back direction of the safety seat, and inserts thesecuring member into the positioning hole when the operative member ismoved from the second position to the first position.
 20. The safetyseat of claim 16, wherein the adjustment assembly comprises an operativemember and a securing member, the securing member being fixed to theconnecting portion, the operative member being provided with a pluralityof positioning grooves, the operative member being configured to bemovable between a first position and a second position in a heightdirection of the safety seat, the securing member being put into thepositioning groove when the operation member is located in the firstposition, and disengaged form the positioning groove when the operativemember is located in the second position.